Webinar 02 demonstration of pv system design pvsyst

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SolPowerPeople #SolarMOOC Demonstration on PV System Design using PVSYT by Dr. Jeffery Lee Johnson of TodoSolar

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Webinar 02 demonstration of pv system design pvsyst

  1. 1. Demonstration of PV system design Using PVSYST Dr. Jeffery Lee Johnson CTO Todo-Solar Coahuila, MexicoEmail: jeff.johnson@todosolar.mx Tele: 871 722 9522 Skype: todosolarmexico
  2. 2. Agenda• Resources• A review of the basic principles of Photovoltaic Engineering• What is PV System design?• Initial Project Assessment: Matching Kwh of consumption (energy needed) to solar Kwh produced using an actual Case Study• Case Study in Design : A real time design demonstration using PVSYS• Comparison of predicted performance to actual performance• Special features of PVSYST, compatibility with other resources• TodoSolar and TodoSolarKids
  3. 3. ResourcesDoc Solstice’s Seasoned Sentiments The question of the day that is on everybody’s minds Does Solar Energy have a future ?
  4. 4. Resources Doc Solstice’s Seasoned Sentiments The question of the day that is on everybody’s minds Does Solar Energy have a future ?Solar Energy is here and is here to stay
  5. 5. BASIC PRINCIPLES OFPHOTOVOLTAIC ENGINEERING
  6. 6. Key Concepts and Equations• The mathematics of PV engineering relies mostly on a single equation - The Schockley diode equation• Watts peak : The Power output of a panel under specific conditions – 1000 W / m2 solar radiation normal (perpendicular to surface) at 25 C and 1 atm. – A normalized quantity that is helpful but not useful and is confusing• Specific yield – The PV designer’s best friend – Specific yield is the Kwh produced per KWp installed per day (Kwh/KW/day) – It is normalized quantity independent of total size of system• Specific yield depends on – Geographical location and climate (solar resource) – Installation and orientation – Design by matching components for optimum performance
  7. 7. The Shockley Diode Equation(The physics of the P-N Junction) eV V I I0 exp 1 I0 exp 1 kT Vthermal e where Vthermal 26mV at 300K kT
  8. 8. A First Look at the Diode Equation eV V BLUE CURVEI I0 exp 1 I0 exp 1 kT Vthermal ewhere Vthermal 26mV at 300K kT
  9. 9. Photo-active materials(semiconductors) Photon Effect on diode equation
  10. 10. The photovoltaic Equation and curve V RED CURVE I I 0 exp 1 I PH Vth I I I0
  11. 11. The Photodiode is at the heart of every opto-electronic device including solar cells Power = I x V Lasers Electrical diode Photodiodes Solar Cells
  12. 12. The Solar Cell Isc and Voc
  13. 13. Variation with Temperature and Irradiation
  14. 14. Variation of Isc and Voc with Radiation ISC varies linearly in proportion with illumination q I ph Voc varies logarithmically VOC ln 1 kT I0 with illumination
  15. 15. ISC and VOC variation withTemperature ISC varies little with changes in temperature q I ph VOC ln 1 kT I0 q I ph Voc Is inversely proportional with VOC ln 1 kT I0 temperature
  16. 16. Solar Cell Power P I V V P V IL I0 exp 1 Vthemal dP dP Vmax 0 I max 0 dV dI
  17. 17. Maximum Power point trackingAll modern inverters have MPPT capability that optimizes the power point for astring or array of solar panels
  18. 18. WHAT IS PV SYSTEM DESIGN?
  19. 19. Panel and series characteristicsString is a series of panels withpredetermined current andvoltage outputV = V1 + V2 + …Vn = ∑ ViI = I1 = I2 = …In
  20. 20. Inverter characteristics Inverters have input requirements •Number of DC inputs •Minimum/Maximum current •Minimum/Maximum Voltage •MPPT range of Voltage
  21. 21. Matching the panels with inverter iscalled “String Sizing”
  22. 22. Matching the panels with inverter iscalled “String Sizing” Inverters have Output characteristics •Peak Power •Specific Yield •Grid connection compatibility •Annual Production of energy Kwh
  23. 23. Matching all components to generate the desired powerand energy output for a client is the called “PV systemDesign”
  24. 24. INITIAL PROJECT ANALYSISA CASE STUDY IN DETERMINING KWH NEEDED
  25. 25. Collect data from Client  Utility bill provides consumption and prices for a year  We know the precise geographical location  A site visit provides: • the area available • orientation possibilities • shading issues • Grid connection • Electrical interface We can now begin the design
  26. 26. Using consumption needs to estimate sizingNeeds 26,823 Kwh per year. Using a Specific yield of 4.5. this clientneeds a minimum system of 16 KW
  27. 27. A CASE STUDY IN PV SYSTEM DESIGNUSING PVSYST
  28. 28. PVSYST Simulation Software http://www.pvsyst.com/
  29. 29. DEMO
  30. 30. COMPARING PREDICTED WITH ACTUAL PERFORMANCE USING SYSTEM MONITORING
  31. 31. http://www.sma-america.com/en_US.htmlhttp://www.sunnyportal.com/Templates/Start.aspxhttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-US
  32. 32. SPECIAL FEATURES OFPVSYST
  33. 33. (Solar Energy made available to Everyone) Twitter: @TodoSolar Twitter: @TodoSolarKidshttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-US

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